1) 

Fe + 2HCl => FeCl2 + H2 

FeCl2 + 2NaOH => Fe(OH)2 + 2NaCl 

Fe(OH)2 + 2HCl => FeCl2 +2H2O 

3FeCl2 + 2Al > 2AlCl3 + 3Fe

a) \(n_{Al}=\dfrac{32,4}{27}=1,2\left(mol\right)\)

PTHH: 2Al + 3CuCl₂ --> 2AlCl₃ + 3Cu

_____1,2--->1,8-------->1,2----->1,8

=> m_Cu = 1,8.64 = 115,2 (g)

b) \(V_{ddCuCl_2}=\dfrac{1,8}{1,5}=1,2\left(l\right)\)

c) \(AlCl_3+3NaOH\rightarrow3NaCl+Al\left(OH\right)_3\downarrow\)

\(Al\left(OH\right)_3+NaOH\rightarrow NaAlO_2+2H_2O\)

A là gì đấy nhỉ ?

a hả 

a là khoa 2k7 và là một streamer nimo về game miniworld 

Bài 1: 

PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)

Ta có: \(n_{Mg}=\dfrac{1}{2}n_{HCl}=\dfrac{1}{2}\cdot0,11\cdot1,5=0,0825\left(mol\right)\)

\(\Rightarrow m_{Mg}=0,0825\cdot24=1,98\left(g\right)\)

Bài 3:

Vì Cu không tác dụng với nước

\(\Rightarrow m=m_{Cu}=0,1\cdot64=6,4\left(g\right)\)

Mg + 2HCl --> MgCl2 + H2

nHCl=0,11*1,5=0,165 mol

=>nMg-0,165/2=0,0825mol

=> mMg=0,0825*24=1,98 g

PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\uparrow\)

            \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

a+b) Ta có: \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)=n_{H_2SO_4}=n_{ZnSO_4}\) 

\(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,3}{0,2}=1,5\left(M\right)=C_{M_{ZnSO_4}}\)

c) Theo PTHH: \(n_{H_2}=n_{Zn}=0,3mol\) \(\Rightarrow V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\)

d) Theo PTHH: \(n_{Fe}=\dfrac{2}{3}n_{H_2}=0,2mol\)

\(\Rightarrow m_{Fe}=0,2\cdot56=11,2\left(g\right)\)

a)

\(Fe + CuSO_4 \to FeSO_4 + Cu\)

Theo PTHH : 

\(n_{CuSO_4} = n_{Fe} = \dfrac{11,2}{56} = 0,2(mol)\\ \Rightarrow V_{dd\ CuSO_4} = \dfrac{0,2}{0,1} = 2(lít)\)

b)

\(n_{CuSO_4} = 0,1.2,5 = 0,25(mol) > n_{Fe}= 0,2\) nên \(CuSO_4\) dư.

Ta có : 

\(n_{CuSO_4\ pư} = n_{FeSO_4} = n_{Fe} = 0,2(mol)\\ \Rightarrow n_{CuSO_4\ dư} = 0,25 - 0,2 = 0,05(mol)\)

Vậy : 

\(C_{M_{CuSO_4}} = \dfrac{0,05}{2,5} = 0,02M\\ C_{M_{FeSO_4}} = \dfrac{0,2}{2,5} = 0,08M\)

a)

$Fe +H_2SO_4 \to FeSO_4 + H_2$

$FeSO_4 + 2KOH \to Fe(OH)_2 + K_2SO_4$
$4Fe(OH)_2 + O_2 \xrightarrow{t^o} 2Fe_2O_3 + 4H_2O$

$n_{Fe_2O_3} = \dfrac{20}{160} = 0,125(mol)$

Theo PTHH : $n_{Fe} = 2n_{Fe_2O_3} = 0,25(mol)$
$m_{Fe} = 0,25.56 = 14(gam)$

b)

$n_{H_2} = n_{Fe} = 0,25(mol)$
$V_{H_2} = 0,25.22,4 = 5,6(lít)$
c)

$n_{H_2SO_4} = n_{Fe} = 0,25(mol)$
$V_{dd\ H_2SO_4} = \dfrac{0,25}{1} = 0,25(lít) = 250(ml)$

\(PTHH:Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ FeSO_4+2KOH\rightarrow Fe\left(OH\right)_2+K_2SO_4\\4 Fe\left(OH\right)_2+O_2\underrightarrow{t^o}2Fe_2O_3+4H_2O\)

\(a.n_{Fe_2O_3}=\dfrac{20}{160}=0,125\left(mol\right)\\ n_{H_2}=n_{H_2SO_4}=n_{Fe}=n_{FeSO_4}=n_{Fe\left(OH\right)_2}=\dfrac{4}{2}.0,125=0,25\left(mol\right)\\ m_{Fe}=0,25.56=14\left(g\right)\\ b.V_{H_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\\ c.V_{ddH_2SO_4}=\dfrac{0,25}{1}=0,25\left(l\right)=250\left(ml\right)\)

a) Chất rắn không tan là Cu

=> m Cu = 19,2(gam)

n Mg = a(mol) ; n Fe = b(mol)

=> 24a + 56b = 32,8 -19,2 = 13,6(1)

$Mg + H_2SO_4 \to MgSO_4 + H_2$
$Fe + H_2SO_4 \to FeSO_4 + H_2$
n H2 = a + b = 6,72/22,4 = 0,3(2)

Từ (1)(2) suy ra a = 0,1 ; b = 0,2

%m Cu = 19,2/32,8  .100% = 58,54%
%m Mg = 0,1.24/32,8   .100% = 7,32%
%m Fe = 100% -58,54% -7,32% = 34,14%

b)

m dd A = 32,8 + 200 - 0,3.2 = 232,2(gam)

n MgSO4 = a = 0,1(mol)

n FeSO4 = b = 0,2(mol)

C% MgSO4 = 0,1.120/232,2   .100% = 5,17%
C% FeSO4 = 0,2.152/232,2   .100% = 13,09%

\(a,n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ n_{\left(CH_3COO\right)_2Ba}=\dfrac{127,5}{255}=0,5\left(mol\right)\)

PTHH: \(BaCO_3+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Ba+CO_2\uparrow+H_2O\)

             0,2<-------0,4<-----------------0,2<----------------0,2

\(\rightarrow n_{\left(CH_3COO\right)_2Ba\left(BaO\right)}=0,5-0,2=0,3\left(mol\right)\)

PTHH: \(BaO+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Ba+H_2O\)

            0,3<----0,15<---------------0,3

\(\rightarrow\left\{{}\begin{matrix}m_{BaCO_3}=0,2.197=39,4\left(g\right)\\m_{BaO}=0,3.153=45,9\left(g\right)\end{matrix}\right.\)

\(b,V_{dd}=\dfrac{0,15+0,4}{1,5}=\dfrac{11}{30}\left(l\right)\\ \rightarrow C_{M\left(\left(CH_3COO\right)_2Ba\right)}=\dfrac{0,5}{\dfrac{11}{30}}=\dfrac{15}{11}M\)